Answering a deceptively simple question: What Is One Degree?
It may seem like a simple question, but the reality is anything but clear-cut.
The Operation Iceberg team follow the epic journey of an iceberg out at sea.
Deserts are the most haunting of all the Earth's landscapes.
The seven continents of the world are made up of four continuous landmasses.
Ben Miller reflects on the similarities between evolution and comedy.
Sir David Attenborough talks about giant underground caves.
See pictures of some of the world's most amazing mountains.
Massive tectonic forces have sculpted and re-sculpted our world in a never-ending journey.
Richard Hammond investigates the workings of Earth.